Finding the Fourth Proportional to 336,667.23, 505,186.74 and 137,128.10

Step by Step Solution

1. Step 1: Write the proportion equation
   336,667.23 : 505,186.74 = 137,128.10 : x
2. Step 2: Convert to fraction form
   336,667.23/505,186.74 = 137,128.10/x
3. Step 3: Cross multiply
   336,667.23x = 505,186.74 × 137,128.10
4. Step 4: Simplify right side
   336,667.23x = 69,275,295,275.46
5. Step 5: Solve for x
   x = 69,275,295,275.46/336,667.23
6. Step 6: Final answer
   x = 205,767.86